Exception: type initializer for 'system.data.sqlclient.sqlconnection'?

Question

I couldn\'t figure out what is the problem for this exception.

The type initializer for \'System.Data.SqlClient.SqlConnection\' threw an exception

Answer 1

I have the same error. And I findout the solution for it by change "app.config":

  
    
      

    
  
  
    
  
  
    
      
        xyz
      
    
  
  
    
    
  

Note: Line [supportedRuntime version="v2.0.50727"] is the most importance.